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Prof Botma Visser takes on rust diseases threatening South Africa’s wheat

09 September 2025 | Story Martinette Brits | Photo Stephen Collett

Safeguarding one of the world’s most vital staple foods was at the heart of the inaugural lecture delivered by Prof Botma Visser, Professor in the Department of Plant Sciences at the University of the Free State (UFS), on Wednesday 3 September 2025. Prof Visser shared insights from nearly two decades of research into wheat rust – a devastating crop disease that threatens both South Africa’s harvests and global food security.

“Wheat production in South Africa is threatened by three fungal pathogens that cause rust disease on the crop. Understanding the factors that contribute to virulence on locally grown cultivars is crucial to ensure continued wheat production,” said Prof Visser.

The fight against evolving wheat rusts

For the past 17 years, Prof Visser’s research has focused on the genetic structure of rust populations and the risks they pose to food security. His work has shown that these populations are dynamic and constantly changing due to genetic mutations within existing races, as well as the introduction of new races into South Africa.

“Computer modelling showed that rust can spread over vast distances by prevailing winds. During the 20th Century, at least four Southern African stem rust races managed to move across the Indian Ocean from Southern Africa to Australia. South Africa, in turn, received multiple new races from mid-Africa across Zambia and Zimbabwe, without any means of stopping these introductions,” he explained.

To respond to this challenge, his team recently implemented MARPLE (Mobile And Real-time Plant disEase) diagnostics using fourth-generation nanopore sequencing technology. This approach allows the rapid characterisation of fungal isolates, specifically targeting genes linked to fungicide resistance and virulence.

“This work,” Prof Visser noted, “is part of an effort to safeguard global wheat production.”

His research is a collaborative effort with Prof Willem Boshoff (Department of Plant Sciences, UFS) and Dr Tarekegn Terefe (Agricultural Research Council – Small Grain, Bethlehem). Together, their work has positioned the UFS as an internationally recognised centre of excellence in wheat rust research.

About Prof Botma Visser

Prof Botma Visser obtained his BSc in Botany and Microbiology (1988), BSc Honours in Microbiology (1989), and MSc in Botany (1993) at the University of the Free State, where he also completed his PhD in Botany in 2004.

His career spans more than 18 years of research into wheat rust pathogens, combining annual surveys, race pathotyping, molecular genetics, and cutting-edge sequencing technologies. His expertise has not only advanced understanding of rust population dynamics in South Africa but also contributed to global collaborative studies on crop disease.

News Archive

Messages and mail – what people say about Kovsies

2014-10-02

Letters from Kovsie students, parents, the community and even visitors to our university from across the globe regularly pour into our mailboxes and onto our social media pages.

To give you a glimpse of what they say about our institution, here are a few examples:

•   If you continue with this innovative thinking then the UFS will soon become the Ivy League institution of South Africa. – Chris Abels, United Kingdom

•   My daughter loves Kovsies. She has really come out of her shell as a result of the wonderful environment created by Kovsie leaders. She is flourishing and has for the second year in a row achieved the distinction of being a top academic student. Once again, thank you for your kind assistance which clearly indicates to me that Kovsies treat their students like family and not merely a number. – Grant Combrink, Port Elizabeth

•   The state of the University of Free State inspired me to go back to school and do my law degree. The cleanliness and the mood of the institution was inspirational and not only to me but also to a few of my colleagues. – Joseph Peter Kgomo, a journalist with the public broadcaster

•   I arrived in Bloemfontein to begin a one year appointment as a Fulbright Scholar. I have remarked to friends and colleagues in America that we can learn a great deal about hospitality towards our foreign visitors by embodying the altruism demonstrated throughout your campus. Thank you for the opportunity to become a Kovsie. – Professor Brenda C Eppley, Professor at Area Community College in Harrisburg, Pennsylvania, USA

•   I would like to congratulate you on the job well done regarding transformation and integration thereof. Indeed, the UFS that I am in is not the UOVS that I was in. – Tefo Masoetsa

•   I attended the Oprah Winfrey graduation ceremony in 2009 and when Dr Desmond Tutu received his honorary Doctorate. On both occasions one felt something big and miraculous was happening and many in the audience were moved. You are doing something down there in the Free State that really deserves attention! – Joy Summers, Producer: Carte Blanche

•   There will be much more hurt before our country is healed, but it will be the Kovsie doctors, psychiatrists and teachers applying the plasters and it will be the Kovsie architects, quantity surveyors, jurists and farmers building and regulating a new country. – Marzanne Lombard, proud former member of Soetdoring and Welwitschia Residences

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